| NOUN | time | femtosecond | one quadrillionth (10^-15) of a second |
|---|
| Meaning | One quadrillionth (10^-15) of a second; one thousandth of a picosecond. | |
|---|---|---|
| Part of | picosecond | One trillionth (10^-12) of a second |
| Parts | attosecond | one quintillionth (10^-18) of a second |
| Broader | time unit, unit of time | A unit for measuring time periods |
| Spanish | femtosegundo | |
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